SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5284e1ca14f0866730dc207001cf8154d91d5e4e249a07df9d04b4fdc6cb4e31' 
  AND token = '6r3i5/thmfjKYjzF3ZC/0coqVOq28kpCRYo2NIKk1mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}